Abstract
In the summer of 1991, sound propagation and reverberation experiments were carried out in the Yellow Sea. Explosive sound sources and omnidirectional hydrophones were used. The sound speed profile consisted of a warmer surface isovelocity layer, a strong thermocline and a cooler isovelocity bottom layer. When both the source and the receiver were located above the thermocline, the transmission loss along a certain course and the non-directional average reverberation intensity showed similar frequency-selective attenuation at around 1300 Hz. On the basis of experimental results and some circumstantial evidence, the authors believe that the observed frequency-selective attenuation is due to swimbladder-bearing fish (probably, anchovies) living only above the thermocline.
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